I have a browning gold shotgun which is a personal favorite, a .44 handgun, a .357 handgun, a .22 handgun, a 7mm rifle, a black powder rifle,and AK-47 and a 9mm handgun and I think I am forgetting a couple. Bet people who have been following my posts didn't see that coming!
Shotguns are easy and most people can still buy them in most states (that I know of) They have a wide range of gauges. I personally have a 12 gauge, and I am able to handle it easily despite the large punch it pack due to the fact it is a well built gun. You can also load them with buckshot which is great for home defense if you are not a dead on shot. It would be ignorant of me not to mention a couple things:
Treat every gun as if it is loaded
Never point one at something you are not willing to kill
Never ever even hold a gun if you are not sure you are comfortable. By that I do not mean you cant have some apprehension, it is normal to be a little skitterish the first time you shoot a gun, and it is best to shoot one that someone you know has before purchasing your own, that way if you do not like it at all, you are not stuck with a gun you hate to have.